Below a part of subtitles from the Angry Birds movie.
77 00:04:25,400 --> 00:04:26,435 Get outta here!
78 00:04:26,520 --> 00:04:28,440 Already? But you're the only one that's had cake.
79 00:04:28,480 --> 00:04:29,480 What...
80 00:04:29,640 --> 00:04:30,640 Mmm.
81 00:04:31,040 --> 00:04:32,268 Oh, that's good stuff.
Can you please tell me what "-'s" is in the bold sentence above? Does "-'s" represent "has", "is" or anything else?